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參數(shù)資料
| 型號： | TPS65123RGT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SINGLE-INDUCTOR QUADRUPLE-OUTPUT TFT LCD POWER SUPPLY |
| 中文描述： | 單電感翻兩番，輸出TFT LCD電源 |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 706K |
| 代理商： | TPS65123RGT |
www.ti.com
Enable and Power Sequencing (TPS65120/1/2/3)
SWN
TPS65120
D1
L1
C1
C3
R4
R3
SWP
FBL
VMAIN
FBM
BOOT
C5
R6
R5
C4
VGH
C2
FBH
RUN
EN
VIN
GATE
R10
R9
C7
P1
PGND
AGND
A
A
LDOIN
LDOOUT
V
IN
= 3.3 V
V
GH
V
LOGIC
= 3.3 V
V
GL
V
MAIN
R1
R2
VIN
RUN
VLOGIC, EN
VMAIN
VGL
VGH
VBOOT
5.75V
GATE, EN_LDOAUX
TPS65120, TPS65121, TPS65123, TPS65124
SLVS531–JUNE 2004
DETAILED DESCRIPTION (continued)
To correctly power up most TFT panels, the gate-drive supplies must be sequenced such that the negative
supply (V
GL
) powers up before the positive supply (V
GH
). The TPS65120/1/2/3 controls this sequence through an
enable pin.
Once RUN is high, the TPS65120/1/2/3 turns on the external P-channel MOSFET P1 (see Figure 18) by pulling
GATE low. GATE is pulled down with a 100 k
resistor. The DC/DC converter then starts, enabling the BOOT
output.
Pulling the enable pin (EN) high enables the MAIN output. When the output voltage V
MAIN
has reached 90% of its
nominal value, the negative output enables. V
GH
is delayed until the negative voltage has reached 90% of its
nominal value.
Pulling the RUN pin low shuts down the device. Power-down sequencing starts by switching off V
GH
and V
GL
.
The V
GH
output capacitor is actively discharged by an internal resistor while V
GL
is only discharged by its
feedback voltage divider. The required time to discharge the output capacitor at V
GL
output depends on the load
current. Once V
FBL
has reached 1.2 V (typ) the main output is turned off followed by the output voltage V
LOGIC
.
This sequence is shown in Figure 19.
When no power sequencing is required on the digital supply voltage (V
LOGIC
), tie EN and RUN signals together
and GATE can be connected to a logic-high level to disable the power-down sequencer. Each output turns off
depending upon load current and output capacitance.
Figure 18. Power Sequencing on Digital Supply Voltage,
V
LOGIC
Figure 19. TPS65120/1/2/3 Power Sequence
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65123RGTR | 功能描述:LCD 驅(qū)動器 Single-Inductor Triple-Output RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65123RGTRG4 | 功能描述:LCD 驅(qū)動器 Single-Inductor Triple-Output RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65123RGTT | 功能描述:LCD 驅(qū)動器 Single-Inductor Triple-Output RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65123RGTT | 制造商:Texas Instruments 功能描述:IC LCD SUPPLY TFT TRIPLE 16-VQFN 制造商:Texas Instruments 功能描述:IC, LCD SUPPLY TFT TRIPLE 16-VQFN |
| TPS65123RGTT | 制造商:Texas Instruments 功能描述:OUTPUT CURRENT MAX:25MA ((NW)) |
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